PATHWAY: masi00020 Help
Entry
Name
Citrate cycle (TCA cycle) - Myxocyprinus asiaticus (Chinese sucker)
Description
The citrate cycle (TCA cycle, Krebs cycle) is an important aerobic pathway for the final steps of the oxidation of carbohydrates and fatty acids. The cycle starts with acetyl-CoA, the activated form of acetate, derived from glycolysis and pyruvate oxidation for carbohydrates and from beta oxidation of fatty acids. The two-carbon acetyl group in acetyl-CoA is transferred to the four-carbon compound of oxaloacetate to form the six-carbon compound of citrate. In a series of reactions two carbons in citrate are oxidized to CO2 and the reaction pathway supplies NADH for use in the oxidative phosphorylation and other metabolic processes. The pathway also supplies important precursor metabolites including 2-oxoglutarate. At the end of the cycle the remaining four-carbon part is transformed back to oxaloacetate. According to the genome sequence data, many organisms seem to lack genes for the full cycle [MD:
M00009 ], but contain genes for specific segments [MD:
M00010 M00011 ].
Class
Metabolism; Carbohydrate metabolism
BRITE hierarchy
Pathway map
Ortholog table
Module
Other DBs
Organism
Myxocyprinus asiaticus (Chinese sucker) [GN:
masi ]
Gene
127455380 dihydrolipoyllysine-residue succinyltransferase component of 2-oxoglutarate dehydrogenase complex, mitochondrial-like isoform X1 [KO:K00658 ] [EC:2.3.1.61 ]
127410965 dihydrolipoyllysine-residue succinyltransferase component of 2-oxoglutarate dehydrogenase complex, mitochondrial-like isoform X1 [KO:K00658 ] [EC:2.3.1.61 ]
127425609 succinate dehydrogenase [ubiquinone] flavoprotein subunit, mitochondrial-like [KO:K00234 ] [EC:1.3.5.1 ]
127419049 succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial-like [KO:K00235 ] [EC:1.3.5.1 ]
127420096 succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial isoform X1 [KO:K00235 ] [EC:1.3.5.1 ]
127438431 succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial-like [KO:K00235 ] [EC:1.3.5.1 ]
127441002 succinate dehydrogenase cytochrome b560 subunit, mitochondrial [KO:K00236 ]
127442742 succinate dehydrogenase cytochrome b560 subunit, mitochondrial-like [KO:K00236 ]
127425078 succinate dehydrogenase [ubiquinone] cytochrome b small subunit A, mitochondrial isoform X1 [KO:K00237 ]
127421782 succinate dehydrogenase [ubiquinone] cytochrome b small subunit B, mitochondrial-like [KO:K00237 ]
127429759 succinate dehydrogenase [ubiquinone] cytochrome b small subunit B, mitochondrial-like [KO:K00237 ]
127419899 pyruvate dehydrogenase E1 component subunit alpha, mitochondrial-like isoform X1 [KO:K00161 ] [EC:1.2.4.1 ]
127438622 pyruvate dehydrogenase E1 component subunit alpha, mitochondrial-like isoform X1 [KO:K00161 ] [EC:1.2.4.1 ]
127431369 dihydrolipoyllysine-residue acetyltransferase component of pyruvate dehydrogenase complex, mitochondrial-like [KO:K00627 ] [EC:2.3.1.12 ]
127428995 dihydrolipoyllysine-residue acetyltransferase component of pyruvate dehydrogenase complex, mitochondrial-like [KO:K00627 ] [EC:2.3.1.12 ]
Compound
C05125 2-(alpha-Hydroxyethyl)thiamine diphosphate
C05381 3-Carboxy-1-hydroxypropyl-ThPP
C15972 Enzyme N6-(lipoyl)lysine
C15973 Enzyme N6-(dihydrolipoyl)lysine
C16254 [Dihydrolipoyllysine-residue succinyltransferase] S-succinyldihydrolipoyllysine
C16255 [Dihydrolipoyllysine-residue acetyltransferase] S-acetyldihydrolipoyllysine
Reference
Authors
Nishizuka Y (ed).
Title
[Metabolic Maps] (In Japanese)
Journal
Tokyo Kagaku Dojin (1980)
Reference
Authors
Nishizuka Y, Seyama Y, Ikai A, Ishimura Y, Kawaguchi A (eds).
Title
[Cellular Functions and Metabolic Maps] (In Japanese)
Journal
Tokyo Kagaku Dojin (1997)
Reference
Authors
Michal G.
Title
Biochemical Pathways
Journal
Wiley (1999)
Related pathway
masi00250 Alanine, aspartate and glutamate metabolism
masi00280 Valine, leucine and isoleucine degradation
masi00630 Glyoxylate and dicarboxylate metabolism
KO pathway
LinkDB
All DBs